Blindstitch sewing machine



C. A. DEARBORN I BLINDSTITCH- SEWING MACHINE 5 sheets-sheet 1*' Original Filed D90- 3, 1924 l VENTOR v Y, ff /v I ATTORNEYS July 13 1926.

ww J 5N 5 w A w Sheena-Sheet 2 c. A.' DEARBORN BLINDsTITcH SEWING MACHINE al Filed Deo. 23, 1924 Y WITNESS July 13 July 13 c. A. DEARBORN- BLINDSTITCH SEWING MACHINE ofgnal Filed Deo. 23, 1924 -25 fixed and yieldin Patentes Julyv 13, i926.

CHARLES A;

December as, 1924, semi Original application 22, 1925. 8e

`tiled dated Decem dated March 6th, 1906. The present apg tion isa division of my application .No 757,653, filed December 23rd, 1924.

The object of improve and licaerial adapt it more especially for felling piped edgesof seams. The presser foot has in the past usually been a single rigidly supported member against which the work is pressed by a yielding work support. In the. new machine the presser foot is divided, the main part at the left of the ridge forming rib above the work support being fixed, while he rightof the ridge forming rib is mounted upon a spring su ported arm to yield'laterally away from the line of stitching under the strain of an exvy cross seams. The

g portions of the presser foot separate in the yertical plane of the; ridge 'forming disk whichdetermines the line offstitching. The spring actingupon'theyielding portion ofthe presser foot tends to move themsame toward the fixed po the presser foot and its normal relation is determined by a conical adjusting screw.

The fixed portion of the presser foot is formed' with an npstanding rib which engages the inwardly presented piped edge of the seam to hold the piping out of the path of the narrow portion of the reciprocating feed"A dog. which in this type of machine Vengages the Work on its upper face. This upstandng rib is transversely grooved or recessed Lin the path of the needle.

The fixed portion of the presser foot also carries a spring pressed dog which engrges the work on the left side of the' ridge form- 45. ingr-ih to thereby hold the goods down closelv to they rib to bring the line of stitches,

i: e.-the line in which the point of the needle emerges in the sewing operation, as far as possible beneath the piped edge.

In order that the invention may be ful described withy g drawings and Dumont, or NEW Yoann'. Y. Annriensrn'cn; szw'nie rtion of A rcs.

no. 757,653. n

maca mi um applicati@ mea my rial m. 45,292. l

In said drawi ig. 1 is a sidezelevation of the improved blind stitch felling machine; f Fig. 2v is a plauview ofthe same with lthe sewing machine arm, the needle shaft, and other parts broken away for the sake of clearness;

Fig. 3 is a detailfront'elevation of the stitch forming' mechanism, showing also the workl supporting mechanism in section;

Fig. 3* is a detail side elevation of parts 66 shown in Fig. 3;

Fig. 4 isa detail view showing the needle in its retracted position;

ig. 5 is a vertical longitudinal sectional view taken on'the` line `5--5 of Fig. 3; 70

Fig. 6Y is a detail horizontal sectional view taken on the line 6 6 of Fig. 1;

Fig. 7 is a detail transverse sectional View ken on the line 7 7 of Fig. 1. 1 is the main Vframe of a sewing machine of M e type set forth in my above named patents and 2 is the sewin machine arm projecting forwardly from t e main bear' lng 3 to a pointvabove and adjacent to a workfsupport similar "to Fig. 3;

upon which which proje shaped `voke 10 journalle 15 and controlled by springs 16.

The U-shaped frame 7 has a downwardly 90, projectingarm 20 connected at 21 by a strong contractile spring 22 attached at its inner end to a flange 23 of the machine frame 1.

Anadjusting screw 25 is threaded in lugs 95 v k26 of the machine 'frame a its i nd' enga es at with the arm 20 and is provided at its rear end with a milled hand operated head 27 by which th adjusted. The head 27 hasl 28 marked off in a suitabl cateat a glance the adjusted position of the I Adjacent to the head 27 is a' grooved cylindrical portion Y29 with which .forward end justably foot secured to the lower end of a p chine arm 2 by screws 35 fixed member.

40 the ridge forming u the machine arm o chine.

grooves formed in the concave upper faces' engages a spring detent mounted upon a1 pin 31 of the machine frame and serving to hold the adjusting-screw 25 against accidental displacement. A second screw 33 is admounted in the lug 26 in the path of the arm 20 to limit the movement of the arm in one direction under the action of the spring 22. t

35 is the main fixed portion of the resser ate 36 which is adjustably mounted on a vertical face of the machine arm 2 by means of machine screws 37. This fixed portion of the presser foot is mounted above the work sup- 15 port to the left of the ridge forming rib and carries additional elements hereinafter referred to.

66 is a shoe formed on the lower end-of 7plate 67 secured to a vertical face of ma- 68, see Fig. 3.v The shoe 66 is fixed in the horizontal plane of the presser foot alongside of the reciprocating feed dog and serves to conlinev the work downwardly 25A adjacent to the feed.

40 is the auxiliary laterally adjustable portion of the presser foot consisting of a short forwardly presented blade mounted upon the lower end of a curved lever 11 piv- 30 oted to the sewing machine arm by means of a screw 42 and having an arm43 projecting to the left above a limiting stop 44, which confines the extent of movement of the auxiliary presser foot member away from the A contractile spring 4,5 engages the arm 43 and connects with an arm 46 upon'the machine frame for giving the presser foot member 40 a spring tendency to move inwardly toward the vertical plane of disk 10. Thisl spring motion of the auxiliary presser foot is limited by a conical adjusting screw 50 threaded in and engaging arm 43 of lever 41. From this structure it will be 45 observed `that this auxiliaryportion '40 of the presser foot is free to yield outwardly against the action of s rin 45 up to the limit of stop`44. Latera ly yielding member 40 is presented directly in front of feeddog 59 70 and above the right-hand `work supporting plate 12. Member 40 cooperates with fixed shoe 66 in resisting upward pressure of the work passing over the work support.

60 is the curved needle carried by the arm 55 61 adjustably mounted upon the needle rock shaft 62 driven by the rock arm 63, the universal joint link .64 and eccentric on' the main drive shaft 65 in the 'same manner as previously employed in this type of ma- The needle reciprocates in guide of the main and auxiliary portions of the presser foot 35 and 40.

70,is the two part reciprocating upper f5, feed secured by screws 71 to the forward bar 75 vand confines it to `versal joint curved plate 70, hereinafter referred to,f

.end by which it llaterally from alug of the-machine arm and secured therein by set screw 7 8. aslot in the feed its vertical plane of operation.v The feed bar 75 has a uniwith a link 81 which in turn has a universal joint 82 with a rock arm 83 adjustably mounted upon the needle rock shaft 62 by means of set screw 84. The upper feed member 70, shown best in Figures 2, 3 and 3@ of the drawings, is a broad having two arallel downwardly presented toothed e ges which engage the upper surface" of the work above adjustably This pin 77 passes through `the two supporting plates 12, one serrated feed edge being arranged above and in the vertical longitudinal plane of each plate 12.

is the looper proper adjustably mounted'in the forward end of a cylindrical looper bar 91 which is secured at its rearl end to a yoke 92 trunnioned upon an eccentric lug 93 of a bearin'sleeve 94, which is journalled upon crank disk 96 carried by the main shaft 65 of the machine. This angularly set crank with universal joint connection withy the looper rod is similar to that shown in my above named patents and forms part of the present invention excepting only as an essential part of the mechanism foroperating the looper in the manner hereinafter described.

The looper ba'r 91 passes freely through aligned bearing sleeves' 100 of a iioating bearing frame 101 which is formed at its forward end with a bearing yoke 102 freely an angu arly set crank pin of the pivoted at 103 upon the lower end of a vertical pivot pin bearn opening the cyin rical bearing 'mounted adjustably in of the sewing machine arm. This bearing block 107 -is vformed with a uared upper can be turne in the s lit socket of the machine frame and secure in the desired adjusted position by the set screw 110. By adjusting the block 107 the vertical pivot pin 105 can erally and forwardlf and backwardly for accurately positioning the vpoint of the looper to cause it to properly cooperate with the needle. The pivot in 105 is confined in the bearing block 107 y means ofthe headed set screw 109 threaded in .the upper end of in 105 and engaging the upper end of bearing block 107.

The main fixed ortion 35 of the presser foot is provided with an upstanding rib 120 upon its inner edge in w ich is formed a needle receiving recess or grooves 121 corre- 110 the split socket 108 iso Sponding, inA lposition with the Vtransverse disk, a presser foot, and stitch forming Y "I groove 122iiithe uppenface of foot member mechanism operating above said` presser y35. A deep `longitudinal groove 125 is foot, with a spring-pressed dogmounted yof the looper 90.

formedin foot member 35 for the operation rupon said presser foot and projecting alongv 130 is a cloth engagin member pivoted in downwardly upon the' work passing over the slotted forward en lof presser foot 35 4said disk. f

' and engaged by aspring lil for holding its 2. In a sewing machine, the combination i cloth engaging downwar y presented end of a work support carrying a ridge-forming side f said ridge-forming diskv for pressing'o 130a1ongside of the'ridge forming disk 10. disk, a presser foot, stitch forming mecha- 75 en the work isy laced in the machine, nism operating above said presser-foot, and

the work su port-is epssed usually by-a suitable feeding means, with a springfoot pedal not shown) connected with U- presseddog mounted upon said presser foot 4shaped frame 7 and the work inserted beand formed with a flange which projects i tween the supporting lates 12 and the two alongideof said ridge-forming disk parallel so part presser oat the heavy r hemmed orv with thev vdirection of feed for pressing tion of the work being presented at the right downwardly upon `the work passing over of the ridgeforming disk beneath the latersaid disk. i

ally yiel g oot member 40. `The edgefof 3. In a sewing machine, the combination the seam, w 'ch is commonly piped, is pref With a yielding y mounted work support, S5 sentedoverthe ridge lforming disk and of a two-part presser foot above said work the work at the left is pressed downwardly support, said presser foot being divided uplby e spring pressed plate or dog 130 to on the line of stitching and having one part confine the work as closely as possible upon fixed and the other part movable laterally he disk :10 to thereby maintain the line of toward and away from the line of stitching, J0 A stitches closely beneath' the piped edge of suitable work feeding means, `stitch forming `t e seam'. e yupstanding rib 120 diverts mechanism including aneedle, and an upthel piped edge of the seam'slightly toward Standing llongitudinal rib upon the fixed i the disk 10 to hold-it out Qf-the wa of the part of said presser foot adjacent to the line top feed member which engages t e 'work of stitching, said rib being formed with a if' parallel with the" longitudinal groove 125. transverse notch to receive the needle.

' eimproved looper mechanism is more 4. In a sewing machine, the combination fully described and is covered by the claims with' a work support and suitable stitch in m above named ori inal a lication' formin mechanism of a twoart resser" y PP i g i P ser. No. 757,653.

foot divided upon the line of stitching, one H, Thestructure of the resser foot with the presser foot part being rigid and the other auxiliary laterally yieliiin portion is an presser foot partl being mounted to yield important novelfeature. Tis yielding porlaterally away from the line of stitching.

tion of the presser fot takes care of un*- 5. In a sewing machine, the combination usually heavy arts of the workpassiiig bewith a work support and suitable stitch j tween the wor support and presser foot. `forming mechanism, of a two-part presser For instance, the passage of cross-seams on foot divided upon the line of stitching, the heavy material will cause the auxiliary .presser foot `part on one side of. the line presser foot member to yield outwardly of stitching being fixed, an upstanding rib while the stitching operation takes place. arranged longitudinally upon saidl fixed -T is laterally ielding foot mem r can alpresser' foot part adjacent to the line of v so be setby t e adjustment of the conical `stitching adapted to engage and guide the screw 50 to suit different grades of work or turned over edge of aseam, the auxiliary thicknesses of material, it .being clear that presser foot part on the other side of the when operating upon thin material foot lineof stitching being adjustable, and a member 40v would naturally operate closer spring for yieldingly holding said auxiliary to the line of stitchingthan it would when part in operative' position. i operating upon heavier 'material `The 6. In a sewingy machine, the combinat-on c ange to suit a particular vgrade of work with'a work support and suitable stiicli p can readily be effected by the operator.- forming mechanism, of a two-part. presser 120 The fixed shoe 66 in rear of the presser foot divided upon the line of stitching, one foot member 40 serves to confine the work presser foot part being fixed with relation above the right-hand work supporting plate to the line of stitching, and the other presser 12 under the action of the-feed dog, stripfoot part being(r movable laterally toward ping the work from Vthe feed dog-as it coinland away from the line of stitching, a spring ,125

lotes 'its/feeding stroke and starts forwardacting upon said movable presser foot pai't,

y `for.1.iew `men`t with the work. and manually operated means forr adjusting- I claim; said movable foot part and determining its` 1. In a sewing machine, the combination operative-relation to the line -of stitching.

'.of a work support carrying a ridge-forming f7. In a sewing machine, the combination 3 aan with a yielding work support, and suitable stitch forming mechanism, of a presser foot Adivided in the line of stitching, a pivoted lever supporting part of said presser foot\ on one side of the line of stitching, a spring engaging said lever for yieldingly holding sai-d presser foot Vpart in position, and an 'adjustable stop for determining the opera*- 'tive position of said presser foot part.

8. In a sewing machine, the combination with a yielding work support carrying a ridge-forming disk,s'uitable stitch forming mechanism, and suitable work feeding means, of a -resser foot divided in theplane of said ri ge-forming disk, a pivotally mounted lever carrying the part of said presser foot on one side of said disk, a spring `engaging vsaid lever for yieldingly holding 3 'a laterally movable presser` said presser foot part in position, and an adjustable stop for determining the operative osition of said presser foot part withi relation to said disk.

9. In a sewing machine,

the combination with a yielding 'work support carrymg a ridge-formin disk and independent work supporting p ates on opposite sides of said disk, of a feed' dog operating above said' work supporting plates, a fixed shoe above one of said plates adjacent to said feeddog, foot member mounted above the work su porting plate in front of said shoe, and a ed) presser foot member above the other work supporting plate on theopposite side of lsaid dis end of said feed bar,

10. In a sewing machine, the combination with a yielding work support, and suitable stitch forming mechanism, of a presser foot divided in the line of stitching, a pivoted lever supporting part of said presserA foot on one side of the line ofstitching, a spring engaging said lever for yieldingly holding said presser foot part in position, and any adjustably nounted cone-headed screw engaging said lever to determine the position of the presser foot part carried thereby.

11. In a sewing machine, the combination of a frame, a work support, a presser foot,

and suitable stitch formingmechanism inkcl'uding a needle rock shaft, with a feed dog A operating above the work support, a feed bar upon which said feed dog is mounted,

a rock arm u on said rock shaft, a link having universa joint c nnections with said feed bar Vand said rock arm, reciprocating said feed bar.

12. In a sewing machine, the combination of a frame, a work support, a presser foot, and suitable stitch forming mechanism including a needle rock shaft, with a feed dog operating above the work support, a feed har upon which said feed dog is mounted, eccentric drive mechanism engaging the rear a guide engaging said feed bar between the ends, a rock arm upon said needle rock shaft, and a connecting link having universal joint connections with said feed bar and said rock arm. i

CHARLES A. DEARBORN.

and lmeans for 

